Codebase Browser
chromium
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chromium/third_party/blink/web_tests/inspector-protocol/dom/resources/display-contents.html 

<!DOCTYPE html>
<html>
<head>
<style>
b {
  display: contents;
}
</style>
</head>
<body>
<a><b>My link</b></a>
</body>
</html>